Minor fix (include was incorrect, but we no longer need to access the interface directly anway).
Minor fix (include was incorrect, but we no longer need to access the interface directly anway).

OpenTechEngine/CEGUI,ruleless/CEGUI,OpenTechEngine/CEGUI,OpenTechEngine/CEGUI,ruleless/CEGUI,OpenTechEngine/CEGUI,ruleless/CEGUI,ruleless/CEGUI